Draft-regulator for hot-water heaters.



W. A. SOHLEIT.

DRAFT REGULATOR FOR HOT WATER HEATERS APPLIUATION FILED JUNE20.19U.

Patented May 21. 1912.

min;

A TTOHNE X WILLIS A. 'SCH'LEIT, OF SYRACUSE, NEW YORK.

DRAFT-REGULATOR FOR HOT-WATER HEATERS.

Specification of Letters Patent.

Patented May 21, 1912.

Application filed June 26, 1911. Serial No. 635,420.

heaters for any purpose where it is desired to maintain a substantially uniform degree of temperature and incidentally to prevent excessive waste of fuel. It is particularly useful in connection with hot water heating systems for incubators, breeders, green houses, drying rooms and other inclosures in which a close regulation of temperature is required, and while it is especially adapted for upright hot water boilers m which the check and draft ports communicate'witheach other above the tire box or combustion chamber, it may be used in connection with other forms of boilers or stoves having water eontainers associated therewith.

The primary-object is to utilize the expansion and contraction of the water under varying degrees of heat for regulating the combustion in' the heater. In other words I have sought to provide simple and etticient means for operating the draft and check valves or dampers of the boiler through the medium of a float resting in or upon a column of heated water connected to the circulating s stem.

Other oijects and uses relating to specific arts of the draft regulating mechanism will e brought out in the following description.

In the drawings-Figure 1 is a front elevation of a boiler and part of a hot water circulating system connected thereto, showrag a water column or expansion tank in section and the exposed portions of the means for regulating the operation of the check and draft dampers or valves of the boiler.

Figs. '2 and 3 are enlarged sectional views of the upper portion ofthe boiler, showing the cheer and draft valves and operatinQ meanstherefor, Fig. 2 showing the checlt valve open and the draft valve closed while Fig. 3 shows the check; valve closed and the draft valve open. i

In order that my invention may be clearly understood, I have shown an upright boiler 1 as provided with a fire box or combustion chamber -2- and water jacket or chamber surrounding the tire box and adapted to be connected to water circulating pipes 4-- forming a part of a heating system. The water chamber -3- is closed at the topby a partition wall 5 having a central opening t5' therethrough communicating with the combustion chamber The boiler is also provided with a hollow top section --7-- having a smoke chamber -8- provided with a draft or outlet port 9. and a check port -10-, the draft port -'9-being adapted to be connected to a suitable chimney or smoke stack not shown, while the check port 10 is provided with a check damper or valve -1 1- hinged at its upper edge at -12 to the top wall of the section -7-. The top of this section -7 which is preferably fiat is formed with a central opening -13 having a lid or. closure -14 fitted therein and normally closed but. provided with a central aperture-15- for receiving a vertically movable rod 16.

The opening -6- in the upper end of the tire box or combustion chamber -2- is provided with a movable closure or disk valve 17 having a central aperture 18- through which the rod 16 is loosely extended. Secured to the lower end of the rod is a shoulder -19- somewhat larger than the aperture ---18-- so as to engage and lift the disk valve -17 when the rod is elevated beyond a predetermined degree in a manner hereinafter described.

The check valve or damper 11- is provided with an inwardly projecting arm -20- rigidly secured thereto below the pivot -12- and having its inner end projecting into the path of movement of an operating member --21, which, in this instance, consists of a circular disk adustably secured to the rod -1(i within the chamher 8-- or between the disk valve --17-- position.

The valve operating rod 16 extends some distance upwardly above the boiler and is pivotally; connected at its upper end to one end of a lever 23 which in turn is fulcrumed at 24- intermediate its ends upon a bracket 25- on one side of an expansion tank or water column -2(3. This expansion tanker water column -2G- is open at the top and has its lower end connected by a pipe -27-- to one of the pipes --4- of the hot water circulating system.

A fioat 28 is movable in the expansion tank or water column -26 and is adapted to rest upon a body of water -29 therein, the upper end of the float being connected by a rod -30 to the corresponding end of the lever 23 which is weighted at ---31- to partially counterbalance the weight of the rod 16-- and parts carried thereby, and at the same time rendering the operationot' the float and valves more sensitive under varying levels of the column ofavater 29 by expansion and contraction.

The shoulder .19- and disk -21 are adjusted relatively to each other and to the arm -20- and disk valve l7-- so as to open the disk valve -17- and simultaneously permit the check valve l'1- to close.

It is now evident that as the temperature ofthe Water in the boiler and circulating system including the water column 26 varies above and below a predetermined degree, the water level in the column will rise and fall, so that when the temperature of the water is below such. predetermined degree, the receding level of the water in the column 26 will allow the float to descend by its own gravity aided by the weight '3l to lift the rod l6- and disks -21- and T-17 carried thereby suflicient-ly to lift the disk valve 17 from its seat upon the upper end of the combustion chamber 2 and at the same time withdrawing the disk 21 from holding engagement with the arm 20-- and allowing the check valve -.-11 to close under its own weight as shown in Fig. This opening of the disk valve -17- places the combustion chamber in direct communication with the draft port -9 thereby in creasing the combustion of the fuel in the combustion chamber 2- and raising the temperature of the water. Now, if the temperatm'e oi the water should be raised beyond the predetermined degree mentioned,

theexpansion of the water column 729-- would\raise the float -28 and thereby eas es lower the rod --16 sufficiently. to cause the disk valve -l7 to close upon its seat on the upper end of the combustion chamber,

while the disk -21- would also engage the arm -20- and open the check valve -'l1- to establish direct communication between the draft port --10- and atmosphere and sion tank 26, thus permitting the float to again descend and produce a repetition of the operation of the draft and check valves previously described. If for any reason the temperature of the water should continue to rise after the disk valve -1'Z is closed, it is evident that the increased expansion of the water would cause the float to rise still farther which in. turn would cause the rod 16- to slide downwardly through the disk valve .-l.7-- to further open the check valve -1Itand thereby additionally check the fuel from increasing combustion. The effect, therefore, of these combined actions of the float and valves controlled thereby is to maintain a uniform tempera ture of the water in the circulating system and thus establish auniform temperature of the room or compartment in which a portion of this system may be installed.

It will be'observed upon reference to the that indicatedin the drawings the check 4 valve -1lwill be opened accordingly later or earlier in the movement of float thereby permitting the is desired to maintain to be raised or lowcred at will. The disk valve -1(.-may also be adjusted lengthwise of the rod by the threaded shoulder or nut 19 for the same purpose. i

What I claim is: l I

In combination with a-hot water heater having a combustion chamber, awater temperature which it chamber, a smoke chamber communicating with thecombustion chamber, said smoke chamber having a check damper in one side thereof provided with an inwardly extending arm, a valve controlling communication between the coml ion chamber and smoke chamber, l i rod n a its seat during the upward movement of the In witness whereof I have hcrci'lnto set rod, 'a check valve operating member admy hand on this 15th day of June 1911. justably mounted on the rod for engaging said arm and operatin the check valve in a ,7 t V I downward'movemantfa water column con- SOI'ILEIT nected to the water chamber of the heater, Witnesses:

-, a'float in said column, and means actuated ,H. E. CHASE,

by the float for operzrting the rod. E. F. SPEAKING. 

